LF2272
DEVICES INCORPORATED
DEVICES INCORPORATED
Colorspace Converter/
Corrector (3 x 12-bits)
DESCRIPTION
The
LF2272
is a high-speed digital
colorspace converter/corrector
consisting of three simultaneous 12-bit
input and output channels for func-
tionality up to 64 Giga (2
36
) colors.
Some of the applications the LF2272
can be used for include phosphor
colorimetry correction, image captur-
ing and manipulation, composite color
encoding/decoding, color matching,
and composite color standards
conversion/transcoding.
The 3 x 3 matrix multiplier (triple dot
product) allows users to easily per-
form three-dimensional perspective
translations or video format conver-
sions at real-time video rates. By
using the LF2272, conversions can be
made from the RGB (color compo-
nent) format to the YIQ (quadrature
encoded chrominance) or YUV (color
difference) formats and vice versa
(YIQ or YUV to RGB). Differing signal
formats in each stage of a system can
be disregarded. For example, using
an LF2272 at each format interface
allows each stage of a system to
operate on the data while in the
appropriate format.
Colorspace Converter/
Corrector (3 x 12-bits)
LF2272
FEATURES
u
50 MHz Data and Computation
Rate
u
Full Precision Internal Calculations
with Output Rounding
u
On-board 10-bit Coefficient Storage
u
Overflow Capability in Low
Resolution Applications
u
Two鈥檚 Complement Input and
Output Data Format
u
3 Simultaneous 12-bit Channels
(64 Giga Colors)
u
Applications:
鈥?Component Color Standards
Translations (RGB, YIQ, YUV)
鈥?Color-Temperature Conversion
鈥?Image Capturing and Manipulation
鈥?Composite Color Encoding/
Decoding
鈥?Three-Dimensional Perspective
Translation
u
Replaces TRW/Raytheon/Fairchild
TMC2272
u
120-pin PQFP
All inputs and outputs, as well as all
control lines, are registered on the
rising edge of clock. The LF2272
operates at clock rates up to 50 MHz
over the full commercial temperature
and supply voltage ranges. A nar-
rower data path can be used to allow
the LF2272 to work with many
different imaging applications.
DETAILS OF OPERATION
All three input ports (A, B, C) and all
three output ports (X, Y, Z) are
utilized to implement a 3 x 3 matrix
multiplication (triple dot product).
Each truncated 12-bit output is the
sum of all three input words multi-
plied by the appropriate coefficients
(Table 1). The pipeline latency is five
clock cycles. Therefore, the sum of
LF2272 B
LOCK
D
IAGRAM
CLK
CWEL
1-0
2
DATA
INPUTS
{
{
B
11-0
C
11-0
12
12
12
12
Y
11-0
Z
11-0
KA
9-0
KB
9-0
KC
9-0
10
10
10
COEFFICIENT
INPUTS
9-MULTIPLIER
ARRAY
Video Imaging Products
1
08/16/2000鈥揕DS.2272-I
{
A
11-0
12
12
X
11-0
DATA
OUTPUTS
1
2
3
4
5
6
7
8
9
